摘要
在厚粘土、粉土、砂层进行旋挖钻孔灌注桩施工,通常由于泥浆孔口补给、泥浆不循环的工艺缺陷,导致塌孔、埋钻、卡钻、缩径、断桩事故频繁发生。在分析低粘、降失水、加速钻渣沉淀的解决机理的前提下,提出了配制低粘度、高降失水、防絮凝的铁铬盐-LV-CMC泥浆并同步孔底补浆工艺,可不需循环泥浆清孔,保证成孔质量,提高工作效率。
For rotary drilling bored grouting pile construction in thick clay,silt and sand layer,borehole collapsing,drill rod burying,drill rod sticking,diameter shrinking and pile breaking often occur because of technical defects such as mud surpplying at borehole orifice and non-recirculation.On the premise of analysis on the mechanism in which low viscosity,fluid loss reduction and speed-up cuttings precipitation were solved,the formula of FCLS LV-CMC mud with low viscosity,high-level fluid loss reduction and anti-precipitation was put forward with simultaneous mud surpplying at hole bottom;hole cleaning by circulating mud was unnecessary to improve working efficiency.
出处
《探矿工程（岩土钻掘工程）》
2012年第2期64-66,69,共4页
Exploration Engineering:Rock & Soil Drilling and Tunneling
关键词
旋挖钻孔灌注桩
铁铬盐-LV-CMC泥浆
低粘降失水泥浆
防絮凝
孔底补浆
rotary drilling bored grouting pile
FCLS LV-CMC mud
mud with low viscosity and fluid loss reduction
anti-precipitation
mud surpplying at hole bottom
